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Introduction
Hey Ninjas!!
While making a web application, we all have to use the different attributes for extra information on the components of the web application. In this blog, you'll get to learn about JSF - f: attribute and how it passes the attribute to the elements.
Now, Let's begin our journey to learn more about JSF - f: attribute.
First, let's have a look at what JSF is.
JSF
The Java standard technology for creating component-based, event-oriented web interfaces is called JavaServer Faces (JSF). JSF permits server-side data and functionality access, just like JavaServer Pages (JSP). JSF is an XML document representing formal components in a logical tree, unlike JSP, which is just an HTML page with server-side capabilities. JSF components are supported by Java objects, separate from HTML, and possess all of Java's features, including the ability to access distant APIs and databases
Now let's have a look at the JSF f: attribute
JSF - f:attribute
The h: attribute tag gives users the ability to transmit a component's parameter or attribute value via an action listener.
F:attribute tag
<h:commandButton id = "submit"
actionListener = "#{userData.attributeListener}" action = "result">
<f:attribute name = "value" value = "Say Hi" />
<f:attribute name = "username" value = "Ninjas" />
</h:commandButton>
Now let's check the attributes which are used.
Tag Attributes
1. name- Specifying the attribute's name
2. values-The attribute's value
Sample code
Data.java
package com.coding.ninjas;
import java.io.Serializable;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
@ManagedBean(name = "userData", eager = true)
@SessionScoped
public class Data implements Serializable {
private static final long serialVersionUID = 1L;
public String data = "1";
public String getData() {
return data;
}
public void setData(String data) {
this.data = data;
}
public void attributeListener(ActionEvent event) {
data = (String)event.getComponent().getAttributes().get("username");
}
}
index.xhtml
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<title>localhost:8080</title>
</head>
<body>
<h2>f:attribute example</h2>
<hr />
<h:form>
<h:commandButton id = "submit"
actionListener = "#{userData.attributeListener}" action = "result">
<f:attribute name = "value" value = "view message" />
<f:attribute name = "username" value = "Ninjas" />
</h:commandButton>
</h:form>
</body>
</html>
An HTML element type's modifier is an HTML attribute. An attribute either alters an element type's default behavior or adds the capability to specific elements that would be ineffective without it.
What is an HTML tag?
All other HTML elements are contained within the <html> tag.
What is servlet?
A Java programming language class known as a servlet is used to increase the functionality of servers that host applications that are accessed via the request-response programming model.
What is <!DOCTYPE> declaration?
It serves as "information" to the browser about the kind of document to anticipate.
What is JSF - f: param tag?
The f: param tag offers the ability to transmit request parameters or parameters to a component.
Conclusion
Finally, you've concluded this article.
Congratulations!! You learned about JSF - f: attributein this blog. You studied the tag, attribute used, and sample program.
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